Twitter changed their service, which used to limit tweets to 140 characters, earlier in the week. Many users have expressed unhappiness with the change, including the authors JK Rowling and Stephen King. One rather more forcefully than the other.

Twitter’s destroyed its USP. The whole point, for me, was how inventive people could be within that concise framework. #Twitter280characters

Those complaints didn’t deter the British emergency services, however, from playing a game of imitating sounds that any parent with toddlers is familiar with.

A spokesperson for the London ambulance service NHS trust said: “This tweet has been seen on Twitter over one million times and helped us engage with hundreds of new people. Some of our staff have said it has made them feel proud of where they work. We always aim to get the balance right as the London ambulance account is also a trusted source of timely and accurate information during a major incident.”

Services with more exotic equipment than mere road ambulances were able to show off – London’s air ambulance went for a “Wokka-Wokka” helicopter noise.